P0455 - 2017 Honda Pilot, 60k miles

Mikerizer

Hero Member
Joined
Dec 13, 2006
Messages
297
Points
18
Location
Jackson MS
Website
www.batauto.com
Make
Honda
Model
Pilot
Year
2017
Miles
60k +
Engine
3.5
P0455 EVAP System (Very) Large Leak Detected

I looked around in the engine compartment...the air filter housing wasn't seated and locked in properly. I buckled it up, and I didn't find any other visible leaks on an eyeball inspection. I cleared the codes and the PO455 came back a few days later.

This is my daughter's car.

What should I look for in troubleshooting? THANKS!
 

grcauto

Hero Member
Joined
May 29, 2014
Messages
858
Points
28
Your evap has nothing to with the air filter or intake.
It's the system that purges the fuel tank fumes. Everyone replaces the gas cap but if the cap is not cracked and threads are not corroded I wouldn't waste my time and money on that. The system is plumbed from the top of the tank to the canister and from there to the intake through the purge valve. There's also a vent valve. May need to smoke the system to find it.
 

grcauto

Hero Member
Joined
May 29, 2014
Messages
858
Points
28
I would test the purge valve. You put it under a vacuum and if it don't hold that's a source of a large leak.
 
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